The campaigns which followed extended over five years; they were in every respect a repetition of previous campaigns in the same regions. The Roman soldiers occasionally got into difficulties through ignorance of the country, and especially of the tides; but, in spite of some severe reverses, they more than held their own against the Germans; these latter indeed began to quarrel among themselves. The differences between Arminius and members of his family were taken advantage of by Germanicus; further differences seemed likely to declare themselves between Arminius and Maroboduus. Tiberius returned to his previous policy. Germany had been sufficiently exhausted; the Rhine with a line of outposts must be the frontier. Germanicus was recalled and given the more coveted position of proconsul of the Eastern frontier. Drusus, the son of Tiberius, took his place in Germany. The authorities consulted by Tacitus, among which are included the memoirs of the younger Agrippina, who was born soon after the mutiny somewhere near Cologne, ascribed the recall of Germanicus to the jealousy of Tiberius. The inconsistency which is involved in giving larger powers and greater responsibility to a dangerous rival does not strike them. There was every precedent for dreading the influence of high official position in the East upon the mind of an ambitious proconsul. Sulla had marched upon Rome from the East; the power of Pompeius was founded upon his victories over Mithridates and the pirates; Antonius had been tempted by his power in the East to grasp at universal dominion; even the young Caius Cæsar had succumbed to Oriental fascinations. Had Tiberius really been in dread of Germanicus, he would have kept him in comparative insignificance at Rome; he certainly would not have put the wealth, the resources, and the armies of the East at his disposal.